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mx5: Optimize lowlevel_init code size

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Optimize mx5 lowlevel_init.S code size:
 - Compute values at compile time rather than at runtime where possible.
 - Assign r4 to hold the zero value rather than setting registers to 0 again and
   again.
 - Associate a function to setup_pll rather than expanding its large macro code
   multiple times.
 - Allocate constant values in section only if used.

Signed-off-by: Benoît Thébaudeau <benoit.thebaudeau@advansee.com>
Cc: Stefano Babic <sbabic@denx.de>
Tested-by: Stefano Babic <sbabic@denx.de>
Acked-by: Stefano Babic <sbabic@denx.de>
master
Benoît Thébaudeau 13 years ago committed by Tom Rini
parent 51535d9f6f
commit dd227b6ea0
1 changed files with 59 additions and 53 deletions
Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL
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  1. 112
      arch/arm/cpu/armv7/mx5/lowlevel_init.S

112
arch/arm/cpu/armv7/mx5/lowlevel_init.S
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@ -24,6 +24,8 @@
#include <generated/asm-offsets.h>
#include <linux/linkage.h>
.section ".text.init", "x"
/*
* L2CC Cache setup/invalidation/disable
*/
@ -34,15 +36,14 @@
mcr 15, 0, r0, c1, c0, 1
/* reconfigure L2 cache aux control reg */
mov r0, #0xC0 /* tag RAM */
add r0, r0, #0x4 /* data RAM */
orr r0, r0, #1 << 24 /* disable write allocate delay */
orr r0, r0, #1 << 23 /* disable write allocate combine */
orr r0, r0, #1 << 22 /* disable write allocate */
ldr r0, =0xC0 | /* tag RAM */ \
0x4 | /* data RAM */ \
1 << 24 | /* disable write allocate delay */ \
1 << 23 | /* disable write allocate combine */ \
1 << 22 /* disable write allocate */
#if defined(CONFIG_MX51)
ldr r1, =0x0
ldr r3, [r1, #ROM_SI_REV]
ldr r3, [r4, #ROM_SI_REV]
cmp r3, #0x10
/* disable write combine for TO 2 and lower revs */
@ -84,8 +85,7 @@
ldr r1, =0x00000203
str r1, [r0, #0x40]
ldr r1, =0x0
str r1, [r0, #0x44]
str r4, [r0, #0x44]
ldr r1, =0x00120125
str r1, [r0, #0x9C]
@ -98,20 +98,29 @@
.macro setup_pll pll, freq
ldr r0, =\pll
adr r2, W_DP_\freq
bl setup_pll_func
.endm
#define W_DP_OP 0
#define W_DP_MFD 4
#define W_DP_MFN 8
setup_pll_func:
ldr r1, =0x00001232
str r1, [r0, #PLL_DP_CTL] /* Set DPLL ON (set UPEN bit): BRMO=1 */
mov r1, #0x2
str r1, [r0, #PLL_DP_CONFIG] /* Enable auto-restart AREN bit */
ldr r1, W_DP_OP_\freq
ldr r1, [r2, #W_DP_OP]
str r1, [r0, #PLL_DP_OP]
str r1, [r0, #PLL_DP_HFS_OP]
ldr r1, W_DP_MFD_\freq
ldr r1, [r2, #W_DP_MFD]
str r1, [r0, #PLL_DP_MFD]
str r1, [r0, #PLL_DP_HFS_MFD]
ldr r1, W_DP_MFN_\freq
ldr r1, [r2, #W_DP_MFN]
str r1, [r0, #PLL_DP_MFN]
str r1, [r0, #PLL_DP_HFS_MFN]
@ -120,12 +129,13 @@
1: ldr r1, [r0, #PLL_DP_CTL]
ands r1, r1, #0x1
beq 1b
.endm
/* r10 saved upper lr */
mov pc, lr
.macro setup_pll_errata pll, freq
ldr r2, =\pll
mov r1, #0x0
str r1, [r2, #PLL_DP_CONFIG] /* Disable auto-restart AREN bit */
str r4, [r2, #PLL_DP_CONFIG] /* Disable auto-restart AREN bit */
ldr r1, =0x00001236
str r1, [r2, #PLL_DP_CTL] /* Restart PLL with PLM=1 */
1: ldr r1, [r2, #PLL_DP_CTL] /* Wait for lock */
@ -158,10 +168,9 @@
/* Gate of clocks to the peripherals first */
ldr r1, =0x3FFFFFFF
str r1, [r0, #CLKCTL_CCGR0]
ldr r1, =0x0
str r1, [r0, #CLKCTL_CCGR1]
str r1, [r0, #CLKCTL_CCGR2]
str r1, [r0, #CLKCTL_CCGR3]
str r4, [r0, #CLKCTL_CCGR1]
str r4, [r0, #CLKCTL_CCGR2]
str r4, [r0, #CLKCTL_CCGR3]
ldr r1, =0x00030000
str r1, [r0, #CLKCTL_CCGR4]
@ -184,11 +193,10 @@
#else
ldr r1, =0x3FFFFFFF
str r1, [r0, #CLKCTL_CCGR0]
ldr r1, =0x0
str r1, [r0, #CLKCTL_CCGR1]
str r1, [r0, #CLKCTL_CCGR2]
str r1, [r0, #CLKCTL_CCGR3]
str r1, [r0, #CLKCTL_CCGR7]
str r4, [r0, #CLKCTL_CCGR1]
str r4, [r0, #CLKCTL_CCGR2]
str r4, [r0, #CLKCTL_CCGR3]
str r4, [r0, #CLKCTL_CCGR7]
ldr r1, =0x00030000
str r1, [r0, #CLKCTL_CCGR4]
@ -214,8 +222,7 @@
/* Switch peripheral to PLL 3 */
ldr r0, =CCM_BASE_ADDR
ldr r1, =0x000010C0
orr r1,r1,#CONFIG_SYS_DDR_CLKSEL
ldr r1, =0x000010C0 | CONFIG_SYS_DDR_CLKSEL
str r1, [r0, #CLKCTL_CBCMR]
ldr r1, =0x13239145
str r1, [r0, #CLKCTL_CBCDR]
@ -225,8 +232,7 @@
ldr r0, =CCM_BASE_ADDR
ldr r1, =0x19239145
str r1, [r0, #CLKCTL_CBCDR]
ldr r1, =0x000020C0
orr r1,r1,#CONFIG_SYS_DDR_CLKSEL
ldr r1, =0x000020C0 | CONFIG_SYS_DDR_CLKSEL
str r1, [r0, #CLKCTL_CBCMR]
#endif
setup_pll PLL3_BASE_ADDR, 216
@ -240,8 +246,7 @@
#if defined(CONFIG_MX51)
/* Run 3.0 at Full speed, for other TO's wait till we increase VDDGP */
ldr r1, =0x0
ldr r3, [r1, #ROM_SI_REV]
ldr r3, [r4, #ROM_SI_REV]
cmp r3, #0x10
movls r1, #0x1
movhi r1, #0
@ -251,14 +256,12 @@
str r1, [r0, #CLKCTL_CACRR]
/* Switch ARM back to PLL 1 */
mov r1, #0
str r1, [r0, #CLKCTL_CCSR]
str r4, [r0, #CLKCTL_CCSR]
#if defined(CONFIG_MX51)
/* setup the rest */
/* Use lp_apm (24MHz) source for perclk */
ldr r1, =0x000020C2
orr r1,r1,#CONFIG_SYS_DDR_CLKSEL
ldr r1, =0x000020C2 | CONFIG_SYS_DDR_CLKSEL
str r1, [r0, #CLKCTL_CBCMR]
/* ddr clock from PLL 1, all perclk dividers are 1 since using 24MHz */
ldr r1, =CONFIG_SYS_CLKTL_CBCDR
@ -289,7 +292,6 @@
ldr r0, =CCM_BASE_ADDR
ldr r1, =0x00808145
orr r1, r1, #2 << 10
orr r1, r1, #0 << 16
orr r1, r1, #1 << 19
str r1, [r0, #CLKCTL_CBCDR]
@ -310,8 +312,7 @@
cmp r1, #0x0
bne 1b
mov r1, #0x0
str r1, [r0, #CLKCTL_CCDR]
str r4, [r0, #CLKCTL_CCDR]
/* for cko - for ARM div by 8 */
mov r1, #0x000A0000
@ -325,9 +326,10 @@
strh r1, [r0]
.endm
.section ".text.init", "x"
ENTRY(lowlevel_init)
mov r10, lr
mov r4, #0 /* Fix R4 to 0 */
#if defined(CONFIG_MX51)
ldr r0, =GPIO1_BASE_ADDR
ldr r1, [r0, #0x0]
@ -346,21 +348,25 @@ ENTRY(lowlevel_init)
init_clock
/* r12 saved upper lr*/
mov pc,lr
mov pc, r10
ENDPROC(lowlevel_init)
/* Board level setting value */
W_DP_OP_864: .word DP_OP_864
W_DP_MFD_864: .word DP_MFD_864
W_DP_MFN_864: .word DP_MFN_864
#if defined(CONFIG_MX51_PLL_ERRATA)
W_DP_864: .word DP_OP_864
.word DP_MFD_864
.word DP_MFN_864
W_DP_MFN_800_DIT: .word DP_MFN_800_DIT
W_DP_OP_800: .word DP_OP_800
W_DP_MFD_800: .word DP_MFD_800
W_DP_MFN_800: .word DP_MFN_800
W_DP_OP_665: .word DP_OP_665
W_DP_MFD_665: .word DP_MFD_665
W_DP_MFN_665: .word DP_MFN_665
W_DP_OP_216: .word DP_OP_216
W_DP_MFD_216: .word DP_MFD_216
W_DP_MFN_216: .word DP_MFN_216
#else
W_DP_800: .word DP_OP_800
.word DP_MFD_800
.word DP_MFN_800
#endif
#if defined(CONFIG_MX51)
W_DP_665: .word DP_OP_665
.word DP_MFD_665
.word DP_MFN_665
#endif
W_DP_216: .word DP_OP_216
.word DP_MFD_216
.word DP_MFN_216

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